The invention provides an optical analog-to-
digital converter based on
polarization modulation, belonging to the field of photoelectric technology, and relates to a photoelectric
signal processing and optical analog-to-
digital converter. N-path current modulation signals uniformly divided by a sampling analog current
signal are respectively input to a magnetic
induction coil by an amplifying circuit; pulsed light emitted by a
laser is polarized into a
linearly polarized light by a
polarizer, and the
linearly polarized light is divided into N light path signals by a
beam splitter, and the N light path signals are respectively input to N photoelectric
branch circuits; the optical
signal of each photoelectric
branch circuit firstly passes through
magneto optic effect material in the magnetic
induction coil, and then is analyzed by an analyzer into an optical signal which is converted into an electrical signal by a photoelectric
detector, the electrical signal is amplified by an
amplifier and is input to the corresponding comparer to carry out threshold value judgment, and a
digital signal is finally output by the comparer. The converter can realize the output of the
digital signal with the traditional binary code and
Gray code, and has the advantages of rapid sampling speed, more effective number bits, no restriction of the binary code and the
Gray code, simple structure and low cost.